Artificial leg



June 19, 1923.

W. E. MORRISON ET AL,

ARTIFICI AL LEG Filed Jan. 13 1923 w w S a me Z K w a wm m a alien v0.1

Patented June 19, 1923.

" UHT E D STATES PATENT oFFIc WILLIAM E. MORRISON AND KALLE KQRPELAINEN, or HARRISBURG, PENNSYLVANIA,

[assrenons rro HARRY w. coornn, OF'HARRISBURG, PENNSYLVANIA.

ARTIFICIAL LEG.

Application filed January 13, 1923. Serial No. 612,498.

' sylvania, have invented certain new and useful Improvements in Artificial Legs, of-

which the following is a specification, reference being had'to the accompanying drawings. I r

This invention relates to certain improvements in artificial legs of a type'for use in connection with an amputation above the knee, and'it is an object of the invention to provide a device of this general character with a novel and improved inside knee control.

Another object of the invention is to provide a novel and improved inside knee control for an artificial leg comprising a lever or arm having a predetermined fixed position upon the knee bolt and which arm or lever is provided with means affording a convenient and efi'ective engagement with the suspender.

Furthermore, it is an object of the invention to provide a novel and improved knee control adapted to be directly engaged withv the knee bolt and wherein said knee bolt is tapered from one end to the other for insertion through a tapered collar comprised in the lever or arm with which the Suspender coacts.

The invention consists in the details of construction and in the combination and arrangement of the several parts of our improved artificial leg whereby certain important advantages are attained and the device rendered simpler, less expensive and other wise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of our invention will hereinafter be definitely claimed.

In order that our invention may be the better understood, we will now proceed to describe the same with reference to the accompanying drawings, wherein Figure l is a view partly in section and partly in elevation illustrating an artificial leg constructed in accordance with an embodiment of our invention; and

Figure 2 is a sectional view taken substantially on the line 2-2 of Figure 1.

As disclosed in the accompanying drawings, 1 denotes the socket or thigh section of. an artificial leg, and 2 denotes thelower leg or shin section, said sectionsl and 2 beingof any ordinary or preferred constructionand pivotally connected through the instrumentality of the knee bolt 3. The sections 1 and 2 are otherwise connected in the-conventional manner. The bolt 3 is tapered from one end to the other, and as herein disclosed said bolt 3 is tubular. I a

At substantially its longitudinal center, a wall of the bolt 3 is provided therethrough with a threaded. opening 4,.Whl0l1201311lhg positively determines. the location of the lever or arm 5 with respect to the bolt 3. The arm or lever 5 comprises a sleeve or collar 6 having a tapered bore 7 which snugly receives the bolt 3 when the arm or le in desired position upon the bolt 3. Threaded through the wall of the sleeve 8 is a holding screw 9 which, when threaded inwardly, extends through the opening 4 whereby the arm or lever 5 is efiectively maintained in desired position upon the knee bolt 3.

Extending outwardly from the sleeve or collar 6 are the parallel arms 10' spaced in a direction lengthwise of the bolt 3. Connecting the outer ends of the arms 10 is a pin 11, said pin being freely disposed through one of the arms 10 but in threaded engagement with the second of said arms whereby the pin can be readily removed or applied when desired. Snugly fitting between the arms 10 and loosely mounted on the pin 11 is a roller 12 preferably of-hard fiber and with which is adapted to be engaged a suspender 13. p The inside knee control as comprised in the arm or lever 5 results in a structurewhich is free of rattle and one which can be readily applied in worln'ng position and ef-- fectively maintained in such position. The

er 5 is.

lever or arm 5 is also rigid in structure and I reason of the convenience and facility constructed in accordance with our invention is vparticularly well adapted for use by with which it may be assembled and operated, and it will also be obviousthat our invention is susceptibleof's'ome change and modification without departing from the principles and spirit thereof and for this reason we do not wish to be understood as limiting ourselves to the precise arrangement and formation .of the several parts herein shown in carry- Y in" out our'in-vention in practice except as hereinafter claimed.

Veclaim:: Y 1. In an artificial leg, the combination with ,a knee bolt .pivotally connecting the thigh section and zthe lower .leg section, a lever provided at one end with a sleeve through which the knee bolt extends, a memher threaded through the wall of thes'l-eeve, said ebOlt being provided with .an opening to receive said member whereby the lever is positively held at a fixed position upon the lance bolt, rand integral parallel arms BX- tending outwardly from "the sleeve and spaced in adirection lengthwise of the knee .bolt and a roller supported by and between the arms, said roller being adapted to have operative engagement with a Suspender;

2. In an artificial *1eg,"the combination with a knee bolt pivotally connecting the thigh section and the lower leg section, a

spaced in a direction lengthwise of the knee bolt, and a roller supported by'and between the arms sald roller being adapted to have operative engagement With a Suspender.

In testimony whereof we hereunto Iafiix our signatures. v v

WILLIAM MORRISON.

KQ'R PELAINENL 

